*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20010
200226
200381
200437
200526
200626
200710
20085
200910
201022
20116
201240
20134
201413
201525
201622
20174
20185
20190
20200
20210
20220
20230
20240
Total362